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SubjectRe: Deep call trace from PCMCIA CF eject
Date
On Wednesday 13 of August 2003 18:53, Russell King wrote:
> On Wed, Aug 13, 2003 at 07:24:56AM -0700, Paul Dickson wrote:
> > Besides the minor concern about the trace itself, a bigger concern on my
> > part is how deep the call trace is (60+ levels). How's it doing for
> > stack space?
>
> Not all those functions listed were involved - never, ever believe an
> x86 call trace as being the absolute truth. 8)
>
> The real calltrace is much closer to:
> > Aug 13 06:57:59 violet cardmgr[1559]: executing: './ide check hde'
> > Aug 13 06:58:00 violet cardmgr[1559]: executing: './ide stop hde'
> > Aug 13 06:58:01 violet kernel: hde: task_no_data_intr: status=0x51 {
> > DriveReady SeekComplete Error } Aug 13 06:58:01 violet kernel: hde:
> > task_no_data_intr: error=0x04 { DriveStatusError } Aug 13 06:58:01 violet
> > kernel: hde: Write Cache FAILED Flushing! Aug 13 06:58:01 violet
> > cardmgr[1559]: + /dev/hde1 umounted
> > Aug 13 06:58:01 violet kernel: updfstab: numerical sysctl 1 23 is
> > obsolete. Aug 13 06:58:02 violet kernel: hde: task_no_data_intr:
> > status=0x51 { DriveReady SeekComplete Error } Aug 13 06:58:02 violet
> > kernel: hde: task_no_data_intr: error=0x04 { DriveStatusError } Aug 13
> > 06:58:02 violet kernel: hde: Write Cache FAILED Flushing! Aug 13 06:58:02
> > violet kernel: Debug: sleeping function called from invalid context at
> > include/linux/rwsem.h:66 Aug 13 06:58:02 violet kernel: Call Trace:
> > Aug 13 06:58:02 violet kernel: [<c011bc81>] __might_sleep+0x61/0x80
> > Aug 13 06:58:02 violet kernel: [<c02376dc>] unlink+0x3c/0xa0
> > Aug 13 06:58:02 violet kernel: [<c0267a32>] kobj_unmap+0x62/0x110
> > Aug 13 06:58:02 violet kernel: [<c026cf62>]
> > blk_unregister_region+0x22/0x30 Aug 13 06:58:02 violet kernel:
> > [<c0287eb3>] ide_unregister+0x2f3/0x8d0 Aug 13 06:58:02 violet kernel:
> > [<d096cba4>] ide_release+0x94/0x130 [ide_cs] Aug 13 06:58:02 violet
> > kernel: [<d096c1fc>] ide_detach+0xac/0xc0 [ide_cs] Aug 13 06:58:02
> > violet kernel: [<d09727e2>] unbind_request+0xd2/0xe0 [ds] Aug 13
> > 06:58:02 violet kernel: [<d0972fa1>] ds_ioctl+0x441/0x770 [ds] Aug 13
> > 06:58:02 violet kernel: [<c01652b0>] sys_ioctl+0x100/0x290 Aug 13
> > 06:58:02 violet kernel: [<c010b1f9>] sysenter_past_esp+0x52/0x71
>
> The problem is IDE - ide_unregister() does the following:
>
> spin_lock_irq(&ide_lock);
> ...
> blk_unregister_region(MKDEV(hwif->major, 0),
> MAX_DRIVES<<PARTN_BITS);
>
> Since blk_unregister_region is sleepy, and sleeping with a spinlock
> held is a big NO NO, it's an IDE problem not a PCMCIA problem. It
> should be calling blk_unregister_region with a spinlock held.

Yep, thanks.
This patch should be sufficient until ide locking rework is ready.

--bartlomiej

drivers/ide/ide.c | 23 +++++++++++------------
1 files changed, 11 insertions(+), 12 deletions(-)

diff -puN drivers/ide/ide.c~ide-unregister-bandaid drivers/ide/ide.c
--- linux-2.6.0-test2-bk7/drivers/ide/ide.c~ide-unregister-bandaid 2003-08-13 19:39:13.281512048 +0200
+++ linux-2.6.0-test2-bk7-root/drivers/ide/ide.c 2003-08-13 19:43:49.900459576 +0200
@@ -778,6 +778,17 @@ void ide_unregister (unsigned int index)
/* More fucked up locking ... */
spin_unlock_irq(&ide_lock);
device_unregister(&hwif->gendev);
+
+ /*
+ * Remove us from the kernel's knowledge
+ */
+ blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
+ for (i = 0; i < MAX_DRIVES; i++) {
+ struct gendisk *disk = hwif->drives[i].disk;
+ hwif->drives[i].disk = NULL;
+ put_disk(disk);
+ }
+ unregister_blkdev(hwif->major, hwif->name);
spin_lock_irq(&ide_lock);

#if !defined(CONFIG_DMA_NONPCI)
@@ -793,18 +804,6 @@ void ide_unregister (unsigned int index)
hwif->dma_prdtable = 0;
}
#endif /* !(CONFIG_DMA_NONPCI) */
-
- /*
- * Remove us from the kernel's knowledge
- */
- blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
- for (i = 0; i < MAX_DRIVES; i++) {
- struct gendisk *disk = hwif->drives[i].disk;
- hwif->drives[i].disk = NULL;
- put_disk(disk);
- }
- unregister_blkdev(hwif->major, hwif->name);
-
old_hwif = *hwif;
init_hwif_data(index); /* restore hwif data to pristine status */
hwif->hwgroup = old_hwif.hwgroup;
_




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